Understanding Blood Types

How Your Blood Type Can Affect Your Health blood type Blood types are categorized into systems There are four possible types in the ABO system: A, B, O and AB In the Rh system, the presence or absence of the D blood link You belong to one of four blood types: O, A, B and AB with an additional Rh factor Canadian Blood Services provides all donors with this information

blood group In major traumas with massive blood loss, many hospitals transfuse O positive blood, even when the patient's blood type is unknown The risk of reaction is much